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Press Release

September 8, 2010

Development of a New Process to Stabilize LED Color

DISCO Corporation (Headquarters: Ota-ku, Tokyo; President: Kazuma Sekiya) has developed a process that controls and stabilizes color irregularities of LED, which will be displayed with panels at SEMICON Taiwan 2010 to be held September 2010.

Background of the process developmentRecently, the demand for LEDs, which control color irregularities when emitting, has increased for household lighting and LED backlit TVs. In the case of florescent type* LED, the flatness of the florescent resin surface, which covers the LED die, affects color irregularities in the light. It is not possible, however, to obtain a high level of flatness of the resin surface using the conventional dispenser system (florescent resin is charged using a syringe-type instrument) or pressing system (florescent resin is charged after setting a wafer into a mold and applying pressure from the top).
In response to this situation, DISCO has developed a process to accurately flatten the surface of the florescent resin using a diamond bit, thereby preventing color irregularities and stabilizing the color of the light emission.
DISCO will recommend the application of this process for LED production in products where stability of coloring is directly related to product quality, such as lighting and TVs.

* Florescent resin LED
The LED die is covered by a phosphor (resin such as YAG) and light from the fluorescent die penetrates the resin. Adjusting the light wavelength and resin thickness makes it possible to obtain white light.

Overview of this processThis process flattens the LED package surface, after charging the florescent resin, using the surface planer (equipment to plane the surface using a diamond bit).